The Innovasic semiconductor IA82527 Controller Area Network (CAN) serial communications controller is a form, fit, and function replacement for the original Intel 82527 serial communications controller. The IA82527 serial communications controller replaces the obsolete Intel 82527 device, allowing users to retain existing board designs, software compilers/assemblers, and emulation tools, thereby avoiding expensive redesign efforts.

General description

CAN protocol uses a multi-master CSMA/CR (carrier sense, multiple access with collision resolution) bus to transfer message objects between network nodes.

The IA82527 supports standard CAN (11-bit CAN-ID) and extended CAN (29-bit CAN-ID), and has the capability to transmit, receive, and perform message filtering on standard and extended message frames.

The IA82527 can store 15 message objects of 8-byte data length. Each message object can be configured as either transmit or receive except for message object 15, which is receive-only. Message object 15 also provides a special acceptance mask designed to filter message identifiers that are received.

The IA82527 also provides a programmable acceptance mask that allows users to globally mask any identifier bits of the incoming message. This global mask can be used for both standard and extended message frames.

The IA82527 is capable of operating at 5,0 V or 3,3 V. This datasheet discusses both modes of operation. Where applicable, characteristics specific to either 5,0-V or 3,3-V operation are identified separately throughout this datasheet.

The IA82527 is manufactured in a reliable 5-V process technology and is available in 44-lead PLCC or PQFP RoHS packages for the automotive temperature range (−40 °C to +125 °C).

Features

The primary features of the IA82527 are as follows:

CAN protocol support

• Standard and extended CAN
• Standard ID data and remote frames
• Extended ID data and remote frames

CAN interface

• Configurable input comparator
• Configurable output driver
• Programmable bit-rate

Global mask, programmable

• Standard message identifier
• Extended message Identifier

Message objects

• 14 transmit/receive buffers
• 1 double buffered receive buffer with programmable mask

Flexible status interface

CPU interface options

• 16-bit multiplexed intel architecture
• 8-bit multiplexed intel architecture
• 8-bit multiplexed non-intel architecture
• 8-bit non-multiplexed non-Intel architecture
• Serial (SPI)

I/O ports (2)

• 8-bit
• Bidirectional

Flexible interrupt structure